This is a pretty simple bolt calculation from first principles. For a given bolt size it looks up the characteristics of a bolt from a 'Bolt Lookup Table'. A bolt preload (or clamping load) is estimated from the bolt torque and a joint slip load for the specified coefficient of friction. A fatigue endurance limit is also calculated for axial loads on the bolt.
It is not rocket science but I have used it a lot for a quick check on bolted joints. Enjoy!
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